I am looking for a reviews/rating dataset for my social commerce application (for building up the recommendation engine). In this dataset, along with product info and reviews/ratings by users, I also require user demographics information like age, gender, occupation.

I have looked through Amazon datasets, unfortunately, they don't have the user info.

I have also looked through UCI repository, but couldn't find anything relevant.

I came upon this paper, and found the dataset description exactly the way I wanted, but unfortunately, this dataset is not open.